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Helena M Amaro1,2, A Catarina Guedes3, Marco A C Preto4

  • 1Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, S/N, P-4450-208 Matosinhos, Portugal. lena.amaro@gmail.com.

Marine Drugs
|September 14, 2018
PubMed
Summary

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This summary is machine-generated.

A new continuous pressurized solvent extraction (CPSE) system efficiently extracts valuable antioxidants like carotenoids and polyunsaturated fatty acids (PUFA) from the microalga Gloeothece sp. This green method significantly boosts yields compared to conventional techniques.

Area of Science:

  • Biotechnology
  • Nutraceuticals
  • Green Chemistry

Background:

  • Microalgae are a rich source of bioactive compounds for nutraceutical applications.
  • Sustainable and efficient extraction methods are crucial for exploiting microalgal potential.
  • Gloeothece sp. is a scarcely studied microalga with potential for antioxidant compound production.

Purpose of the Study:

  • To develop and optimize a laboratory-made continuous pressurized solvent extraction (CPSE) system.
  • To maximize the extraction of antioxidant compounds, specifically carotenoids and polyunsaturated fatty acids (PUFA), from Gloeothece sp.
  • To evaluate the efficiency and environmental impact of the CPSE method compared to conventional techniques.

Main Methods:

  • A continuous pressurized solvent extraction (CPSE) system was designed and constructed.
Keywords:
CPSEPUFAantioxidantcyanobacteriamicroalgapressurized liquid extraction

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  • Green chemical principles were applied, using ethanol as a GRAS solvent.
  • Optimization involved sequential adjustment of biomass, solvent flow-rate/pressure, temperature, and solvent recirculation.
  • Extraction efficiency was assessed by measuring carotenoid and PUFA content and antioxidant capacity.
  • CPSE was compared against ultrasound-assisted extraction (UAE).

    • Main Results:

    • Optimal extraction conditions for Gloeothece sp. bioactive compounds were determined to be 60 °C and 180 bar.
    • Solvent recirculation in CPSE significantly increased extraction yields: 11-fold for β-carotene (3 cycles) and 7.4-fold for C18:2 n6 t (5 cycles) compared to open systems.
    • CPSE demonstrated superior performance over UAE, yielding 3-fold more total carotenoids and 1.5-fold more total PUFA.
    • Specific compounds like 18:3 n3 showed a remarkable 9.6-fold increase with CPSE.

    Conclusions:

    • The developed CPSE system is an efficient and greener method for extracting bioactive compounds from Gloeothece sp.
    • CPSE offers significant advantages in extraction yield and resource efficiency for nutraceutical applications.
    • This method reduces production costs and environmental impact, making microalgal bioactive compound extraction more sustainable.